Only a select few Vikings carried the ultimate weapon of their era: the feared Ulfberht sword. Fashioned using a process that would remain unknown to the Vikings' rivals for centuries, the Ulfberht was a revolutionary high-tech tool as well as a work of art. How did Viking sword makers design and build the Ulfberht, and what was its role in history? NOVA uses cutting-edge science and old-fashioned detective work to reconstruct the Ulfberht and unravel its mystery.
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